Radiotube



1933- R. H. FEDLER i,8%,506

RADIOTUBE Filed June 18, 1939 INVENTO-R ATTORN EY$ Patented Jan. 31,1933 umran STATES rarest ROBERT E. FIDLER, OF NOR-TH ARLINGTON, NEWJERSEY, ASSIGNOB '10 TUNG-SOL LAMP WORKS, INC., OF NEWARK, NEW JERSEY, AGORPOBATEON OF DELAWARE RADIOTUBE Application filed June 18,

This invention relates to radio tubes.

One object of the invention is a tube having an insulating plate mountedupon and supported directly by the anode supporting posts in a novel andimproved manner, and a further object is a tube of this generalcharacter wherein the tension and anchor hook for the filament issupported by the insulating plate and assembled thereupon and fastenedthereto in a manner to facilitate the assembly and to assure uniformtensioning and spacing of the filament. Another object of the inventionis a tube having an insulating plate with metallic eyelets formed andmounted therein for the accommodation of the anode and anchor supportsand for fastening the plate thereto by welding the supports to theeyelets in the exact and adjusted position desired. A further object isa tube structure wherein the filament tension hook or hooks and anchorsupports are formed as units and then assembled, adjusted and fastenedupon the insulating plates by welding the supports to eyelets formed inthe plates in the posit-ion desired.

For a better understanding of the invention reference may be had to theaccompanying drawing forming a part of this application wherein:

Fig. 1 is a perspective view of a radio tube embodying the inventionwith a part of the bulb broken away,

Fig. 2 is a plan view of a part thereof,

Fig. 8 is a plan view corresponding to Fig.

2 showing a further step in the manufacture,

Fig. 3a is a perspective view of an eyelet utilized in the construction,

Fig. 4a is a perspective View showing another step in the assembly,

Fig. 4b is a perspective view showing another step in the assembly,

Fig. 5 is view showing the method of tensioning the filament hook andfastening the hook support to the insulating plate, and

Fig. 6 is a perspective view of a part of a modified form of tubeembodying the invention.

Referring to the drawing I have shown my invention as embodying a radiotube having a plate 1, plate support posts 2, grid 3, fila- 1930. SerialNo. 461,946.

sired practice,- this plate having holes or openin s 6 for accommodatingthe plate support posts 2 and similar holes or openings 7 for thereception'of the filament anchor hook supports. The holes 6 and 7 of theblank of Fig. 2 are then provided with metallic eyelets'as for exampleof the character indicated in Fig. 304, these eyelets being designatedgenerallyby the numeral 8 and having a flange 9 engaging one side of theplate and tubular part 10 passing through the hole or opening to theother side of'the mica plate. The tubular parts 10 include tongues 11which may be bent or peened over to anchor the eyelet in the opening asindicated in dotted lines in Fig. 3a. The method of assembly andattachment ofthe plate 5 is indicated in Fig. 4a. The plate 5 of Fig. 3is inserted over the posts 2, the latter projecting into or through theeyelets 8, and after the insulating plate is adjusted to the requiredposition the eyelets 8 are joined to the posts 2 in any suitable manner,as for example by spot welding. With the plate thus adjusted andfastened tothe posts 2 to be rigidly supported thereby the grid posts 3'pass up through guide slots 12 formed in the plate 5 in the usualmanner, as indicated in. Figs. 1 and 4b.

The next step in the assembly is the mounting of the filament tensionhooks 13 with the anchor support posts it upon the insulated plate. Thetension hook and anchor wire 13 is fastened to the anchor post 14, asfor example by spot welding, into a unitary structure with the hookdisposed at a fixed distance from the post 14 or in other words theanchor wire being cut to a predetermined length and welded to the post14 prior to the mounting upon the insulating plate. This length ispredetermined in the stamping of the blank of through the eyelet 8within the opening 7 formed in the plate and by adjusting the post 14 upand down the exact tension desired for the filament 4 may be readilyobtained and in that position the post 14 is fastened to the eyelet 8,as for example by spot Welding, the distance between the dot and dashlines and the full line illustration of the anchor wire 13 of Fig. 5indicating the approximate adjustment from one position to the other. Inthe particular embodiment shown in Figs. 1 to 5 there are two filaments4 and two anchor units for tensioning the filaments.

The modification of Fig. 6 shows a slightly difierent type of tubewherein the two anchor posts carry two separate and independent plates16 with a filament 17 in each oval shaped plate. The insulating plate asfor example 18 is mounted upon and attached to the posts 15 in the samemanner as is the plate 5 upon the posts 2 above described. Also theanchor and tension hook 13 and the post 14 units are mounted upon theplate 18 in exactly the same manner as these units are mounted in theother modification described above.

By means of this construction the mica plates may be accuratelypositioned and firinly fastened to the support posts with markedfacility and with a minimum of time and at minimum expense. Moreover,the filaments are accurately and uniformly tensioned with the properspacing thereof by means of the construction and method of constructionset forth, and in addition to a .more satisfactory product of moreuniform quality the manufacture and production of the tube are greatlyfacilitated.

I claim:

1. A radio tube including a filament, a pair of supporting posts, aninsulating spacer disk having eyeleted openings for the accommodation ofand attachment to said posts, said disk having an additional eyeletedopening for the reception of an anchor support member and an anchor unitcomprising an anchor support member and an angularly disposed tensionwire hook member of predetermined length fastened to the support memberintermediate its ends, said unit being adjustable lengthwise of saidsupport member in said last named eyeleted opening with the hook memberengaging the filament for adjusting the tension during the operation offastening the member to the eyelet of the opening.

2. A radio tube as in claim 1 wherein the posts carry an anode plate andthe insulating disk has guide and spacing slots for the reception ofgrid posts.

3. A radio tube as in claim 1 wherein the eyeleted openings of theinsulating disk include hollow rivets with the sleeve part of the rivethaving tongues which are peened over to hold the eyelets within theopenings.

4. A radio tube including a relatively adjustable supporting post and aninsulating nseaaoe spacer disk, the latter having an eyeleted openinginto which the post passes and to which the post is 'adjustablyfastened, said opening being just large enough to accommodate said post.

5. In a tube as in claim 4 wherein the disk is anchored to the post bywelding the eyelet to the post.

6. A radio tube including a filament, an insulating support having aneyeleted opening for the reception of an anchor support memher and ananchor unit comprising an anchor support member and an angularlydisposed tension wire hook member of predetermined length fastened tothe support member intermediate its ends, said unit being adjustablelengthwise of the support member in said last named eyeleted openingwith the hook member engaging the filament for adjusting the tensionduring the operation of fastening the unit to the eyelet of the opening.

7 The method of making a radio tube which consists in positioning aninsulating disk with eyeleted openings formed therein upon supportingposts and fastening the disk in position by adjusting it up and downupon the posts with the latter passing through the eyeleted openings andthen welding the posts and the eyelets together. forming an anchor unitby fastening a tension hook of predetermined length to an anchorsupport, and then mounting the unit by inserting the sup port through aneyeleted opening in the insulating disk adjusting the same upand down toobtain the required filament tension and then welding the support to theeyelet in the opening.

8. The method of supporting an anchor hook and tensioning the filamentof a radio tube which consists in positioning and anchoring aninsulating support adjacent the filament forming an anchor unit byfastening a. tension hook of predetermined length to an anchor support,and, then mounting the unit upon said insulating support by insertingthe anchor support through an opening therein, adjusting th unit up anddown to obtain the required filament tension and then anchoring the unitto the insulating support in the adjusted position.

9. A radio tube of the character set forth in claim 6 wherein theeyeleted opening of the. insulating support includes a hollow rivet withthe sleeve part of the rivet having a tongue peened over tohold theeyelet within the opening.

In testimony whereof, I have signed my name to this specification.

ROBERT H. FIDLER.

